Footnotes from Chapter 3     Footnote 1, pg. 45 An interesting treatment of the history of CNC ... Footnote 2, pg. 47 An interesting article on converting an old CNC to a PC is given by Mark Albert, "Software is the CNC," ... Footnote 3, pg. 49 Appendix Two lists common questions the OEMs are asked daily. Questions concerning board functions, replacement procedures and factory recommended testing procedures are outlined in this listing. Footnote 4, pg. 52 See also Section 5.5.1 and Section 7.9 in the CNC Toolbox. Footnote 5, pg. 56 Classes are offered at the major machine shows or through professional trade organizations... Footnote 6, pg. 61 See the reference given in section 14.14 in the CNC Toolbox. Footnote 7, pg. 62 Read more in an article by Chuck Raskin, "The Science of Tuning Servo Motors,"...       Please visit often, more content coming for the CNC links and exercises.